java - 线程中的异常 "main"org.hibernate.AnnotationException : @OneToOne or @ManyToOne on

Question

嗨，我刚刚创建了一个应用程序，它通过一对一映射保存表中的数据

每当我尝试将数据保存在表中时，我都会收到以下错误。

`Exception in thread "main" org.hibernate.AnnotationException: @OneToOne or @ManyToOne on com.mapping.onetoone.Instructor.theInstructorDetail references an unknown entity: com.mapping.onetoone.InstructorDetail`

这是我带有 @Entity 和 OneToOne 注释的代码Instructor.java

@Id
@GeneratedValue(strategy=GenerationType.IDENTITY)
@Column(name="id")
private int id;

@Column(name="first_name")
private String firstName;

@Column(name="last_name")
private String lastName;

@Column(name="email")
private String email;

@OneToOne(cascade=CascadeType.ALL   )
@JoinColumn(name="instructor_detail_id")
private InstructorDetail theInstructorDetail;

public Instructor(){}

public Instructor(String firstName, String lastName, String email) {
    super();
    this.firstName = firstName;
    this.lastName = lastName;
    this.email = email;
}

public int getId() {
    return id;
}

public void setId(int id) {
    this.id = id;
}

public String getFirstName() {
    return firstName;
}

public void setFirstName(String firstName) {
    this.firstName = firstName;
}

public String getLastName() {
    return lastName;
}

public void setLastName(String lastName) {
    this.lastName = lastName;
}

public String getEmail() {
    return email;
}

public void setEmail(String email) {
    this.email = email;
}

public InstructorDetail getTheInstructorDetail() {
    return theInstructorDetail;
}

public void setTheInstructorDetail(InstructorDetail theInstructorDetail) {
    this.theInstructorDetail = theInstructorDetail;
}

@Override
public String toString() {
    return "Instructor [id=" + id + ", firstName=" + firstName + ", lastName=" + lastName + ", email=" + email
            + ", theInstructorDetail=" + theInstructorDetail + "]";
}

这是我的InstructorDetail.java

@Id
@GeneratedValue(strategy=GenerationType.IDENTITY)
@Column(name="id")
private int id;

@Column(name="youtube_channel")
private String youTubeChannel;

@Column(name="hobby")
private String hobby;

public InstructorDetail(){}

public InstructorDetail(String youTubeChannel, String hobby) {
    super();
    this.youTubeChannel = youTubeChannel;
    this.hobby = hobby;
}

public int getId() {
    return id;
}

public void setId(int id) {
    this.id = id;
}

public String getYouTubeChannel() {
    return youTubeChannel;
}

public void setYouTubeChannel(String youTubeChannel) {
    this.youTubeChannel = youTubeChannel;
}

public String getHobby() {
    return hobby;
}

public void setHobby(String hobby) {
    this.hobby = hobby;
}

@Override
public String toString() {
    return "InstructorDetail [id=" + id + ", youTubeChannel=" + youTubeChannel + ", hobby=" + hobby + "]";
}

CreateInstructor.java

public static void main(String[] args) {

    SessionFactory factory=new Configuration().configure("hibernate1.cfg.xml")
            .addAnnotatedClass(Instructor.class).buildSessionFactory();
    Session session = factory.getCurrentSession();
    try
    {
        System.out.println("Object created. Now creating Instructor object...");
        Instructor ins=new Instructor("elon", "musk", "elonmusk@hotmail.com");

        System.out.println("Creating InstructorDetail object...");
        InstructorDetail theInstructorDetail=new InstructorDetail("vella Panti Adda", "Acting");

        ins.setTheInstructorDetail(theInstructorDetail);

        session.beginTransaction();
        System.out.println("Saving data....");

        session.save(ins);
        session.getTransaction().commit();

        System.out.println("Data saved!");

    }
    finally
    {
        factory.close();
    }
}

谁能帮帮我。

Answer 1

你已经尝试过这个。

public Instructor(String firstName, String lastName, String email) {
    super();
    this.firstName = firstName;
    this.lastName = lastName;
    this.email = email;
    this.theInstructorDetail= new InstructorDetail();
}

我认为你应该启动所有属性。